tiny little counter at a fair price!

[martin martin]

https://www.ebay.com/itm/HEWLETT-PACKARD-Vintage-5221A-Electronic-Counter/143559697768?hash=item216cd32568:g:K0MAAOSwVPBec805

[newxito]

Nice device, and it uses a 2N3055 transistor!!! I built an amplifier with these transistors 45 years ago, probably the last time I have seen one of them. I remember that they were very popular in Spain in the 1970s.

[jf...@my-deja.com]

On Saturday, March 21, 2020 at 4:33:05 AM UTC-7, newxito wrote:

Nice device, and it uses a 2N3055 transistor!!! I built an amplifier with these transistors 45 years ago, probably the last time I have seen one of them. I remember that they were very popular in Spain in the 1970s.

You can still get them in Silicon Valley.  See page 16:  https://anchor-electronics.com/price-list.pdf , and don't forget the plastic equivalents (MJE3055, TIP3055, etc.).

Almost every transistor manufacturer sold them.  I remember reading that the 2N3055 spec was so loose that they could re-mark their rejects for other part numbers.  Conversely, in most of my non-demanding applications (audio amplifiers, power supply pass transistors, etc.), most of the power npn transistors (e..g., TIP35)  were interchangeable as long as I did not exceed the actual BVceo.

[Charles MacDonald]

On 2020-03-21 10:18 a.m., 'jf...@my-deja.com' via neonixie-l wrote:

> Almost every transistor manufacturer sold them.  I remember reading that
> the 2N3055 spec was so loose that they could re-mark their rejects for
> other part numbers.  Conversely, in most of my non-demanding
> applications (audio amplifiers, power supply pass transistors, etc.),
> most of the power npn transistors (e..g., TIP35)  were interchangeable
> as long as I did not exceed the actual BVceo.

a few numbers were registers with "loose" specs.

see attch (RCA 2n3055 is the right hand column).


--
Charles MacDonald VA3CPY Stittsville Ontario
cm...@zeusprune.ca Just Beyond the Fringe
No Microsoft Products were used in sending this e-mail.

[newxito]

Got some 2N3055 transistors... time to make a "High Power" nixie clock with a big heatsink :-)

[HuggerMugger]

Have you looked inside? 2N3055 aren’t that unobtainable but still ...

I got two pars 2SK135/2SJ50 .... From China.

 

/M

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[newxito]

I’ve got these ones (ST, with the marking on the top) from Reichelt Germany for $0.9 each, probably the last ones, because now they are no longer listed.